Hello All,
I am currently using the EZB4 for my 54 biped robot. The robot weighs 13 pounds. And I need help picking out the correct type of motors.
The EZ-B motors won’t cut it for I need motors with torque of at least 60 kg.cm. I would like to use servo motors since they have built in potiometers and I can know their position. However I am having trouble finding high torque servos in my price range. (Any thing less than $60.)
I considered using dc motors and rigging up some potiometers or buying dc motors with built in quadrature encoders. But I am not sure how to use these inputs with EZ-B.
does anyone know of cheap 60kg.cm servos I can use. (Or about $20-$30, 30kg.cm servos)
or can anybody body help me figure out how to use potiometers or quadrature encoders with EZ-B.
i am a high schooler learning to do this by themself, and a beginner. Thanks for reading. I hope you can help. Thanks.
Does anyone know how to use a potentiometer for dc motor positioning with EZB?
or does anyone know if I can use encoders to know the position of dc motors and how I would do so with EZB
thankd
Use the sabertooth motor controller combined with a kangaroo.
Or
Use an hbridge connected to the motor wires of a servo PCB. You can create a giant servo from the guts of a small servo
Hello @Robotist_in_training,
I'd recommend looking into what the inMoov community doing. They also remove the Pots from their servos for a few different applications.
Some inMoov builders use the TS-80 servo which I believe is analog and will generate a lot of noise. You may want to look into digital servos.
Here's a discussion about different large form factor RC servo motors for the inMoov: https://groups.google.com/forum/#!topic/inmoov/FW3tZmAdfBs
@robotist_in_training Yes The Inmoov Robot uses quite a few large servos with the pot removed the wires extended and the pin removed on the main gear so the servo does not stop but is controlled by the pot which is located on the limb or body. the strength is from gearing. which means there is a reduction in speed. With your robot, speed may be an issue. some members use this kind of servo. usually from china see picture.
@nallycat thanks everyon for the help. Nallycat if I use the servos you recommend can I still control position?
@Robotist_in_Training I assume you can they are just a Servo. but I would suggest you do more research, maybe someone that uses this type of servo could respond.
...that would be me. I've have several of these types of servos and they work great with the EZB. It takes a little longer than a second to move the full travel. Noise level is less than a hobby servo. And super strong lifting power for some of their larger KG servo/motors. Only issue I see with these is their physical size and fitting them into a project.
@fxrtst
Thanks for the comment I’ve been out of town and haven’t had a chance to check to forums till now. Just verifying I can control the position on the fee tech motors?